HISTORY OF OUR VACUUM TUBES
All produces have passed US Bell ISO 9002 International Quality System Certification, EWC ISO 9001:2000 International Quality System Certification, DIN DS-58-1800 Series from DS-10 to DS 30-58-1800, also DIN EN 12975-1:2006-06, DIN EN 12975-2-20060-06,CE certification, ATC Certification and SICC Certification, Members of SESSA and national brand name products.

The glass vacuum tubes have the strength to withstand hall stones < 25mm and have a working life of 15 years. These Glass Solar Solar Tubes are 1000 times more efficient than a plain copper rod.